Power-operated hand implement



March 4 1924. l;486,05l

J. STEJSKAL., JR

POWER OPERATED HAND IMPLEMENT Filed Jan. 25. 1923 Patented lidar, 4, 19242.

JOSEPH STEJSKAL, JR., F OAK PARK, ILLINOIS.

PWER-OPERATED HAND IIYIPLEMENT.

Application led January 25, 1823. Serial No. 615,430.

To all whom t may concern:

Be it knownthat I, JOSEPH STEJsxAL, J r., a citizen of the United States of America, and a resident of Oak Fark, county of Cook, and State of Illinois, have invented a new and useful Improvement in Power-Operated Hand Implements, of which the following is a specification.

rIhis invention relates to power operated hand implements, and especially to such devices having` a handle adapted to receive interchangeably a plurality of working` members. Y

The main objects of the invention are to provide for such an implement, a handle member having a lgri) part and provided with a chuck adapted to receive various iniplements including a routing tool and a drill, and also provided with power transmission mechanism at the opposite end or head of said handle, having various adjustments'to correspond with the needs of the several members; and to provide such a device adapted for adjustment to oscillate a routing tool or valve grinder andlto rotate a drill. l

Illustrative embodiments of this invention are shown'by the accompanyingV drawings in which Figure l is a side view of a hand implement equipped with a routing tool at one end and a power supply means at-the opposite end.

Figure 2 is mainly a vertical axial section through Figure l.

Figure 3 is an axial section through an implement mainly similar to Figure 1, but equipped with a drill.

Figure is a cross section on the line 4 4 of Figure 2.

Figure 5 is a cross sectionv on the linee-5 of Figure 3.

Figure 6 is a fragmentary view mainly in axial section of a modified form of implement equipped with a wide angle oscillating bit adapted to actuate a valve as required in grinding. Y

Figure 7 is a fragmentary view showing the right end of an implement similar to that shown in Figure 3 but with a grinding member substituted in place of the drill.

Figure 8 is a cross section at 8--8 on Figure 2.

In the construction shown in the drawings (first see Figures 1 and 2), the implement comprises a cylindrical handle 1, having a head 2 at one end, where power is rej ceived, and a tool holding chuck 3 at the opposite end.

The chuck 3 at its outer end is formed as shown in Figure 4, and'is exteriorlythreaded as shown Yat e. This end of the chuck is tubular and is longitudinally slotted as at 5. Wh'en the shankof a routing tool, drill7 or other similar tool 6 is inserted in the aperture? it is clamped in place by an interiorly threaded sleeve 8, which is knurled exteriorly to permit ready tightening by hand on the slotted and exteriorly threaded chuck 3, as usual with such chucks.

rljhe opposite end of said chuck is elongated and of shaft-like character as at 3',

`and this shank Vextends through the handle .provided in the form of bushings 10 and 11,l

preferably of brass, mounted rigidly in the ends of the steel handle l. I

rIhe handle head 2 is of hollow cap-shape and is interiorly threaded vas at 12 to engage the corresponding exterior threads 13 on the handle 1. The outer end of said head 2 is provided with an eccentric longitudinal tubular projection on hub 14 to ref ceive a shorttransmission" shaft 15. Said shaft 1 5 is a rotary crank oscillator device to operate as will be described. It is secured in vplace vby an interiorly threaded hexagonal bushing 16 engaging said hub 14 at 17. Said bushing is provided with an inwardly turned flange 18to engage the ra-V dial fiange or'shoulder 19 on said shaft, with the iiange 20 of the power supply shaft 21 interposed. I-Iublll has a bearing bushing- 22 for the shaft or connector 15.

The shaft 15 at its inner end has a vslightly eccentric crank partor crank pin 23 adapted to play in the slot. 9 of chuck head 9, either half or endV ofsaid slot being actually used with a given setting. The

eccentricity of hub `141 and the length of theV virtual crank arm for Pin 23 'are so related that the pin 23 Vnever reaches or' passes the center of slot 9 or the axis of ber' 2l adapted recei`- shank 3'. Hence, rotation ot connector l5 oscillates the chuck 3 and with it *hatever tool 6 is held thereby.

In Figure 2, the eccentricity of the pin 23 relative to shaft 15 is slight, and as a consequence the chuck 3 oscillates through a small angle, as bestadapted for proper actuation of a routing tool shown in Figure l. ln Figure 6 the eccentricity of the pin is greater so that its range 01' travel is greater, and it consequently oscillates the chuck and tool through a wide angle, sach as required in valve grinding. Here we see the tool 6, adapted for engaging the slot oi" a valve (not shown) 'for oscillating the same :or grinding.

The flenible power member 2l is provided with :i threaded end coni ltor socket memthe correspondingly threaded end oi shaft l5. A flexible tubular casiiig' 2l is provided for shaft 2l.

Referring to Figure 3, the implement is similar to that shown in Figure 2, except that the handle head and transmission shaft are ot modified form adapt-ed to provide for continuous rotary movement oi chuck 3 instead of oscillatory movement. l? or this purpose', the head 2d is symmetrical in shape and its hub` part 2li is coaxial with the handle l. -The" transmission shaft 25 v is provided on its inner end with a head 26 instead of a crankpin, which head lits in the middle or' slot 9 so; that rotation of shaft 25 will cause the chuck 3 to rotate therewith. Otherwise,- the construction is similar to that of Figur-e 2. Y

Referring to Figure 7, only the righthand end or tooleholding part of the implement is shown with a grinding wheel 27 attached in place oi a drill or other tool. In this instance, the detachable tool mein ber instead of having a shank to be gripped by the chuck 3 in the usual way, is provided with a cup-'shaped supporting part 28, which is interiorly threaded to fit on the outside of' the chuck in place of the sleeve 8. rllhe tool 27 may equally well be in the for-m ot a. buiier or other similar device.

Y In order to change the implement from a router to a drilling tool the head 2 is exchanged from head 24 and vice versa.

`exchanged for shaft 25 by unscrewing at 2l. The method of interchanging tools relative to chuck 8 is thought to be clear without further explanation.

Although only two speciiic embodiments n of this invention are herein shown and described, it is to be understood that no attempt has been made to show all practical forms or". embodiment and that some of the details oi the constructions shown may be altered or omitted without departing trom the spirit oit tl the following claims.

l claim: Y Y

i. fr power operated hand implement comprising a handle part,- a rotary power transmitting member mounted in said handle part, means including a flexible torsion shaft and Van interchangeable connector adapted to effect a specific mode of operation ior' supplying rotary power to one' end of said transmitting member and means for attaching a working tool to thc opposite end of said transmitting member.

2. A power operated hand implement comprising a handle having a head at one end and a chuck at the other end adapted to receive tools interchangeably, said head having a rotary power receiving connector operatively connected to said chuck, said connector and chuck being mutuallyformed for cooperation to produce oscillation of said chuck.

AKv power operatedV hand implement comprising a handle having a chuck adapted to receive tools interchangeably at one end of the implement, in combination with a rotary power receiving connector mounted eccentrically at the opposite end, said connector and chuck beingy mutually formed for cooperation to produce oscillation of said chuck. y

4t. rl tool comprising in combination a tubular handle, a chuck at one end of said handle, and a removable head at the opposite end, said chuck having a shank extending through said handle and provided with a removable end-piece or" head-like character to secure saidchuck in place. v

Signed at Berwyn, lll.j this 20th day of Jan., 1923. Y

JOSEPH STEJSKAL, JR;

is invention as defined by 

